1272696421 has 4 divisors (see below), whose sum is σ = 1328031072. Its totient is φ = 1217361772.

The previous prime is 1272696379. The next prime is 1272696533. The reversal of 1272696421 is 1246962721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1246962721 = 173 ⋅7207877.

It is a cyclic number.

It is not a de Polignac number, because 1272696421 - 2¹¹ = 1272694373 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272696121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27667291 + ... + 27667336.

It is an arithmetic number, because the mean of its divisors is an integer number (332007768).

Almost surely, 2^1272696421 is an apocalyptic number.

It is an amenable number.

1272696421 is a deficient number, since it is larger than the sum of its proper divisors (55334651).

1272696421 is an equidigital number, since it uses as much as digits as its factorization.

1272696421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55334650.

The product of its digits is 72576, while the sum is 40.

The square root of 1272696421 is about 35674.8710018691. The cubic root of 1272696421 is about 1083.6980060082.

The spelling of 1272696421 in words is "one billion, two hundred seventy-two million, six hundred ninety-six thousand, four hundred twenty-one".